Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Harlem, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-353 A FTBNMTXCDS0  3310 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-353 0 FTBNMTXCDS0  3310 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-353 1   792K CHARTER IP ENABLED SERVICES, LLC 648      
406-353 2 FTBNMTXCDS0  3310 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-353 3 FTBNMTXCDS0  3310 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-353 4 FTBNMTXCDS0  3310 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-353 5 HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-353 6 MSSLMTMA0MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648      
406-353 7 FTBNMTXCDS0  3310 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-353 8 FTBNMTXCDS0  3310 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-353 9 HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.